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from 1c6e4932ee0 PR tree-optimization/81588 * tree-ssa-reassoc.c (optimize [...] new 009baa50551 Backport fix for PR 80769

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Summary of changes: gcc/ChangeLog | 12 +++++ gcc/testsuite/ChangeLog | 6 +++ gcc/testsuite/gcc.dg/strlenopt-31.c | 25 +++++++++ gcc/testsuite/gcc.dg/strlenopt-31g.c | 9 ++++ gcc/tree-ssa-strlen.c | 98 ++++++++++++++++++++++++------------ 5 files changed, 117 insertions(+), 33 deletions(-) create mode 100644 gcc/testsuite/gcc.dg/strlenopt-31.c create mode 100644 gcc/testsuite/gcc.dg/strlenopt-31g.c